In-situ twistable bilayer graphene

Autor: Cheng Hu, Tongyao Wu, Xinyue Huang, Yulong Dong, Jiajun Chen, Zhichun Zhang, Bosai Lyu, Saiqun Ma, Kenji Watanabe, Takashi Taniguchi, Guibai Xie, Xiaojun Li, Qi Liang, Zhiwen Shi
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Scientific Reports, Vol 12, Iss 1, Pp 1-8 (2022)
Druh dokumentu: article
ISSN: 2045-2322
DOI: 10.1038/s41598-021-04030-z
Popis: Abstract The electrical and optical properties of twisted bilayer graphene (tBLG) depend sensitively on the twist angle. To study the angle dependent properties of the tBLG, currently it is required fabrication of a large number of samples with systematically varied twist angles. Here, we demonstrate the construction of in-situ twistable bilayer graphene, in which the twist angle of the two graphene monolayers can be in-situ tuned continuously in a large range with high precision. The controlled tuning of the twist angle is confirmed by a combination of real-space and spectroscopic characterizations, including atomic force microscopy (AFM) identification of crystal lattice orientation, scanning near-field optical microscopy (SNOM) imaging of superlattice domain walls, and resonant Raman spectroscopy of the largely enhanced G-mode. The developed in-situ twistable homostructure devices enable systematic investigation of the twist angle effects in a single device, thus could largely advance the research of twistronics.
Databáze: Directory of Open Access Journals
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